Electronic cigarette battery



FIG. 1 is a perspective view of an electronic cigarette battery showing my new design;

FIG. 2 is another perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken lines are for the purposes of illustrating portions of the electronic cigarette battery and form no part of the claimed design. 

CLAIM The ornamental design for an electronic cigarette battery, as shown and described. 